samples/font/font.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        font.cpp
   3 // Purpose:     wxFont demo
   4 // Author:      Vadim Zeitlin
   5 // Modified by:
   6 // Created:     30.09.99
   7 // RCS-ID:      $Id$
   8 // Copyright:   (c) 1999 Vadim Zeitlin
   9 // Licence:     wxWindows licence
  10 /////////////////////////////////////////////////////////////////////////////
  11
  12 // For compilers that support precompilation, includes "wx/wx.h".
  13 #include "wx/wxprec.h"
  14
  15 #ifdef __BORLANDC__
  16     #pragma hdrstop
  17 #endif
  18
  19 // for all others, include the necessary headers (this file is usually all you
  20 // need because it includes almost all standard wxWindows headers
  21 #ifndef WX_PRECOMP
  22     #include "wx/wx.h"
  23
  24     #include "wx/log.h"
  25 #endif
  26
  27 #include "wx/choicdlg.h"
  28 #include "wx/fontdlg.h"
  29 #include "wx/fontenum.h"
  30 #include "wx/fontmap.h"
  31 #include "wx/encconv.h"
  32 #include "wx/splitter.h"
  33 #include "wx/textfile.h"
  34
  35 // ----------------------------------------------------------------------------
  36 // private classes
  37 // ----------------------------------------------------------------------------
  38
  39 // Define a new application type, each program should derive a class from wxApp
  40 class MyApp : public wxApp
  41 {
  42 public:
  43     // override base class virtuals
  44     // ----------------------------
  45
  46     // this one is called on application startup and is a good place for the app
  47     // initialization (doing it here and not in the ctor allows to have an error
  48     // return: if OnInit() returns false, the application terminates)
  49     virtual bool OnInit();
  50 };
  51
  52 // MyCanvas is a canvas on which we show the font sample
  53 class MyCanvas: public wxWindow
  54 {
  55 public:
  56     MyCanvas( wxWindow *parent );
  57     virtual ~MyCanvas();
  58
  59     // accessors for the frame
  60     const wxFont& GetTextFont() const { return m_font; }
  61     const wxColour& GetColour() const { return m_colour; }
  62     void SetTextFont(const wxFont& font) { m_font = font; }
  63     void SetColour(const wxColour& colour) { m_colour = colour; }
  64
  65     // event handlers
  66     void OnPaint( wxPaintEvent &event );
  67
  68 private:
  69     wxColour m_colour;
  70     wxFont   m_font;
  71
  72     DECLARE_EVENT_TABLE()
  73 };
  74
  75 // Define a new frame type: this is going to be our main frame
  76 class MyFrame : public wxFrame
  77 {
  78 public:
  79     // ctor(s)
  80     MyFrame(const wxString& title, const wxPoint& pos, const wxSize& size);
  81
  82     // accessors
  83     MyCanvas *GetCanvas() const { return m_canvas; }
  84
  85     // event handlers (these functions should _not_ be virtual)
  86     void OnQuit(wxCommandEvent& event);
  87     void OnAbout(wxCommandEvent& event);
  88
  89     void OnIncFont(wxCommandEvent& event) { DoResizeFont(+2); }
  90     void OnDecFont(wxCommandEvent& event) { DoResizeFont(-2); }
  91
  92     void OnBold(wxCommandEvent& event);
  93     void OnItalic(wxCommandEvent& event);
  94     void OnUnderline(wxCommandEvent& event);
  95
  96     void OnwxPointerFont(wxCommandEvent& event);
  97
  98     void OnViewMsg(wxCommandEvent& event);
  99     void OnSelectFont(wxCommandEvent& event);
 100     void OnEnumerateFamiliesForEncoding(wxCommandEvent& event);
 101     void OnEnumerateFamilies(wxCommandEvent& WXUNUSED(event))
 102         { DoEnumerateFamilies(FALSE); }
 103     void OnEnumerateFixedFamilies(wxCommandEvent& WXUNUSED(event))
 104         { DoEnumerateFamilies(TRUE); }
 105     void OnEnumerateEncodings(wxCommandEvent& event);
 106
 107     void OnCheckNativeToFromString(wxCommandEvent& event);
 108
 109 protected:
 110     bool DoEnumerateFamilies(bool fixedWidthOnly,
 111                              wxFontEncoding encoding = wxFONTENCODING_SYSTEM,
 112                              bool silent = FALSE);
 113
 114     void DoResizeFont(int diff);
 115     void DoChangeFont(const wxFont& font, const wxColour& col = wxNullColour);
 116
 117     size_t      m_fontSize; // in points
 118
 119     wxTextCtrl *m_textctrl;
 120     MyCanvas   *m_canvas;
 121
 122 private:
 123     // any class wishing to process wxWindows events must use this macro
 124     DECLARE_EVENT_TABLE()
 125 };
 126
 127 // ----------------------------------------------------------------------------
 128 // constants
 129 // ----------------------------------------------------------------------------
 130
 131 // IDs for the controls and the menu commands
 132 enum
 133 {
 134     // menu items
 135     Font_Quit = 1,
 136     Font_About,
 137     Font_ViewMsg,
 138     Font_IncSize,
 139     Font_DecSize,
 140     Font_Bold,
 141     Font_Italic,
 142     Font_Underlined,
 143     Font_wxNORMAL_FONT,
 144     Font_wxSMALL_FONT,
 145     Font_wxITALIC_FONT,
 146     Font_wxSWISS_FONT,
 147
 148     Font_Choose = 100,
 149     Font_EnumFamiliesForEncoding,
 150     Font_EnumFamilies,
 151     Font_EnumFixedFamilies,
 152     Font_EnumEncodings,
 153     Font_CheckNativeToFromString,
 154     Font_Max
 155 };
 156
 157 // ----------------------------------------------------------------------------
 158 // event tables and other macros for wxWindows
 159 // ----------------------------------------------------------------------------
 160
 161 // the event tables connect the wxWindows events with the functions (event
 162 // handlers) which process them. It can be also done at run-time, but for the
 163 // simple menu events like this the static method is much simpler.
 164 BEGIN_EVENT_TABLE(MyFrame, wxFrame)
 165     EVT_MENU(Font_Quit,  MyFrame::OnQuit)
 166     EVT_MENU(Font_ViewMsg, MyFrame::OnViewMsg)
 167     EVT_MENU(Font_About, MyFrame::OnAbout)
 168
 169     EVT_MENU(Font_IncSize, MyFrame::OnIncFont)
 170     EVT_MENU(Font_DecSize, MyFrame::OnDecFont)
 171     EVT_MENU(Font_Bold, MyFrame::OnBold)
 172     EVT_MENU(Font_Italic, MyFrame::OnItalic)
 173     EVT_MENU(Font_Underlined, MyFrame::OnUnderline)
 174
 175     EVT_MENU(Font_wxNORMAL_FONT, MyFrame::OnwxPointerFont)
 176     EVT_MENU(Font_wxSMALL_FONT, MyFrame::OnwxPointerFont)
 177     EVT_MENU(Font_wxITALIC_FONT, MyFrame::OnwxPointerFont)
 178     EVT_MENU(Font_wxSWISS_FONT, MyFrame::OnwxPointerFont)
 179
 180     EVT_MENU(Font_CheckNativeToFromString, MyFrame::OnCheckNativeToFromString)
 181
 182     EVT_MENU(Font_Choose, MyFrame::OnSelectFont)
 183     EVT_MENU(Font_EnumFamiliesForEncoding, MyFrame::OnEnumerateFamiliesForEncoding)
 184     EVT_MENU(Font_EnumFamilies, MyFrame::OnEnumerateFamilies)
 185     EVT_MENU(Font_EnumFixedFamilies, MyFrame::OnEnumerateFixedFamilies)
 186     EVT_MENU(Font_EnumEncodings, MyFrame::OnEnumerateEncodings)
 187 END_EVENT_TABLE()
 188
 189 // Create a new application object: this macro will allow wxWindows to create
 190 // the application object during program execution (it's better than using a
 191 // static object for many reasons) and also declares the accessor function
 192 // wxGetApp() which will return the reference of the right type (i.e. MyApp and
 193 // not wxApp)
 194 IMPLEMENT_APP(MyApp)
 195
 196 // ============================================================================
 197 // implementation
 198 // ============================================================================
 199
 200 // ----------------------------------------------------------------------------
 201 // the application class
 202 // ----------------------------------------------------------------------------
 203
 204 // `Main program' equivalent: the program execution "starts" here
 205 bool MyApp::OnInit()
 206 {
 207     // Create the main application window
 208     MyFrame *frame = new MyFrame(wxT("Font wxWindows demo"),
 209                                  wxPoint(50, 50), wxSize(600, 400));
 210
 211     // Show it and tell the application that it's our main window
 212     frame->Show(TRUE);
 213     SetTopWindow(frame);
 214
 215     // success: wxApp::OnRun() will be called which will enter the main message
 216     // loop and the application will run. If we returned FALSE here, the
 217     // application would exit immediately.
 218     return TRUE;
 219 }
 220
 221 // ----------------------------------------------------------------------------
 222 // main frame
 223 // ----------------------------------------------------------------------------
 224
 225 // frame constructor
 226 MyFrame::MyFrame(const wxString& title, const wxPoint& pos, const wxSize& size)
 227        : wxFrame((wxFrame *)NULL, -1, title, pos, size), m_textctrl(NULL)
 228 {
 229     m_fontSize = 12;
 230
 231     // create a menu bar
 232     wxMenu *menuFile = new wxMenu;
 233
 234     menuFile->Append(Font_ViewMsg, wxT("&View...\tCtrl-V"),
 235                      wxT("View an email message file"));
 236     menuFile->AppendSeparator();
 237     menuFile->Append(Font_About, wxT("&About...\tCtrl-A"), wxT("Show about dialog"));
 238     menuFile->AppendSeparator();
 239     menuFile->Append(Font_Quit, wxT("E&xit\tAlt-X"), wxT("Quit this program"));
 240
 241     wxMenu *menuFont = new wxMenu;
 242     menuFont->Append(Font_IncSize, wxT("&Increase font size by 2 points\tCtrl-I"));
 243     menuFont->Append(Font_DecSize, wxT("&Decrease font size by 2 points\tCtrl-D"));
 244     menuFont->AppendSeparator();
 245     menuFont->Append(Font_Bold, wxT("&Bold\tCtrl-B"), wxT("Toggle bold state"), TRUE);
 246     menuFont->Append(Font_Italic, wxT("&Oblique\tCtrl-O"), wxT("Toggle italic state"), TRUE);
 247     menuFont->Append(Font_Underlined, wxT("&Underlined\tCtrl-U"),
 248                      wxT("Toggle underlined state"), TRUE);
 249
 250     menuFont->AppendSeparator();
 251     menuFont->Append(Font_CheckNativeToFromString,
 252                      wxT("Check Native Font Info To/From String"));
 253
 254     wxMenu *menuSelect = new wxMenu;
 255     menuSelect->Append(Font_Choose, wxT("&Select font...\tCtrl-S"),
 256                      wxT("Select a standard font"));
 257
 258     wxMenu *menuStdFonts = new wxMenu;
 259     menuStdFonts->Append(Font_wxNORMAL_FONT, wxT("wxNORMAL_FONT"), wxT("Normal font used by wxWindows"));
 260     menuStdFonts->Append(Font_wxSMALL_FONT,  wxT("wxSMALL_FONT"),  wxT("Small font used by wxWindows"));
 261     menuStdFonts->Append(Font_wxITALIC_FONT, wxT("wxITALIC_FONT"), wxT("Italic font used by wxWindows"));
 262     menuStdFonts->Append(Font_wxSWISS_FONT,  wxT("wxSWISS_FONT"),  wxT("Swiss font used by wxWindows"));
 263     menuSelect->Append(-2, wxT("Standar&d fonts"), menuStdFonts);
 264
 265     menuSelect->AppendSeparator();
 266     menuSelect->Append(Font_EnumFamilies, wxT("Enumerate font &families\tCtrl-F"));
 267     menuSelect->Append(Font_EnumFixedFamilies,
 268                      wxT("Enumerate fi&xed font families\tCtrl-X"));
 269     menuSelect->Append(Font_EnumEncodings,
 270                      wxT("Enumerate &encodings\tCtrl-E"));
 271     menuSelect->Append(Font_EnumFamiliesForEncoding,
 272                      wxT("Find font for en&coding...\tCtrl-C"),
 273                      wxT("Find font families for given encoding"));
 274
 275     // now append the freshly created menu to the menu bar...
 276     wxMenuBar *menuBar = new wxMenuBar;
 277     menuBar->Append(menuFile, wxT("&File"));
 278     menuBar->Append(menuFont, wxT("F&ont"));
 279     menuBar->Append(menuSelect, wxT("&Select"));
 280
 281     // ... and attach this menu bar to the frame
 282     SetMenuBar(menuBar);
 283
 284     wxSplitterWindow *splitter = new wxSplitterWindow(this);
 285
 286     m_textctrl = new wxTextCtrl(splitter, -1,
 287                                 wxT("Paste text here to see how it looks\nlike in the given font"),
 288                                 wxDefaultPosition, wxDefaultSize,
 289                                 wxTE_MULTILINE);
 290
 291     m_canvas = new MyCanvas(splitter);
 292
 293     splitter->SplitHorizontally(m_textctrl, m_canvas, 100);
 294
 295     // create a status bar just for fun (by default with 1 pane only)
 296     CreateStatusBar();
 297     SetStatusText(wxT("Welcome to wxWindows font demo!"));
 298 }
 299
 300 // --------------------------------------------------------
 301
 302 class MyEncodingEnumerator : public wxFontEnumerator
 303 {
 304 public:
 305     MyEncodingEnumerator()
 306         { m_n = 0; }
 307
 308     const wxString& GetText() const
 309         { return m_text; }
 310
 311 protected:
 312     virtual bool OnFontEncoding(const wxString& facename,
 313                                 const wxString& encoding)
 314     {
 315         wxString text;
 316         text.Printf(wxT("Encoding %d: %s (available in facename '%s')\n"),
 317                     ++m_n, encoding.c_str(), facename.c_str());
 318         m_text += text;
 319         return TRUE;
 320     }
 321
 322 private:
 323     size_t m_n;
 324     wxString m_text;
 325 };
 326
 327 void MyFrame::OnEnumerateEncodings(wxCommandEvent& WXUNUSED(event))
 328 {
 329     MyEncodingEnumerator fontEnumerator;
 330
 331     fontEnumerator.EnumerateEncodings();
 332
 333     wxLogMessage(wxT("Enumerating all available encodings:\n%s"),
 334                  fontEnumerator.GetText().c_str());
 335 }
 336
 337 // -------------------------------------------------------------
 338
 339 class MyFontEnumerator : public wxFontEnumerator
 340 {
 341 public:
 342     bool GotAny() const
 343         { return !m_facenames.IsEmpty(); }
 344
 345     const wxArrayString& GetFacenames() const
 346         { return m_facenames; }
 347
 348 protected:
 349     virtual bool OnFacename(const wxString& facename)
 350     {
 351         m_facenames.Add(facename);
 352         return TRUE;
 353     }
 354
 355     private:
 356         wxArrayString m_facenames;
 357 } fontEnumerator;
 358
 359 bool MyFrame::DoEnumerateFamilies(bool fixedWidthOnly,
 360                                   wxFontEncoding encoding,
 361                                   bool silent)
 362 {
 363     MyFontEnumerator fontEnumerator;
 364
 365     fontEnumerator.EnumerateFacenames(encoding, fixedWidthOnly);
 366
 367     if ( fontEnumerator.GotAny() )
 368     {
 369         int nFacenames = fontEnumerator.GetFacenames().GetCount();
 370         if ( !silent )
 371         {
 372             wxLogStatus(this, wxT("Found %d %sfonts"),
 373                         nFacenames, fixedWidthOnly ? wxT("fixed width ") : wxT(""));
 374         }
 375
 376         wxString facename;
 377         if ( silent )
 378         {
 379             // choose the first
 380             facename = fontEnumerator.GetFacenames().Item(0);
 381         }
 382         else
 383         {
 384             // let the user choose
 385             wxString *facenames = new wxString[nFacenames];
 386             int n;
 387             for ( n = 0; n < nFacenames; n++ )
 388                 facenames[n] = fontEnumerator.GetFacenames().Item(n);
 389
 390             n = wxGetSingleChoiceIndex(wxT("Choose a facename"), wxT("Font demo"),
 391                                        nFacenames, facenames, this);
 392
 393             if ( n != -1 )
 394                 facename = facenames[n];
 395
 396             delete [] facenames;
 397         }
 398
 399         if ( !facename.IsEmpty() )
 400         {
 401             wxFont font(12, wxFONTFAMILY_DEFAULT, wxFONTSTYLE_NORMAL,
 402                         wxFONTWEIGHT_NORMAL, FALSE, facename, encoding);
 403
 404             DoChangeFont(font);
 405         }
 406
 407         return TRUE;
 408     }
 409     else if ( !silent )
 410     {
 411         wxLogWarning(wxT("No such fonts found."));
 412     }
 413
 414     return FALSE;
 415 }
 416
 417 void MyFrame::OnEnumerateFamiliesForEncoding(wxCommandEvent& WXUNUSED(event))
 418 {
 419     static wxFontEncoding encodings[] =
 420     {
 421         wxFONTENCODING_ISO8859_1,
 422         wxFONTENCODING_ISO8859_2,
 423         wxFONTENCODING_ISO8859_5,
 424         wxFONTENCODING_ISO8859_7,
 425         wxFONTENCODING_ISO8859_15,
 426         wxFONTENCODING_KOI8,
 427         wxFONTENCODING_CP1250,
 428         wxFONTENCODING_CP1251,
 429         wxFONTENCODING_CP1252,
 430     };
 431
 432     static const wxString encodingNames[] =
 433     {
 434         wxT("Western European (ISO-8859-1)"),
 435         wxT("Central European (ISO-8859-2)"),
 436         wxT("Cyrillic (ISO-8859-5)"),
 437         wxT("Greek (ISO-8859-7)"),
 438         wxT("Western European with Euro (ISO-8859-15)"),
 439         wxT("KOI8-R"),
 440         wxT("Windows Central European (CP 1250)"),
 441         wxT("Windows Cyrillic (CP 1251)"),
 442         wxT("Windows Western European (CP 1252)"),
 443     };
 444
 445     int n = wxGetSingleChoiceIndex(wxT("Choose an encoding"), wxT("Font demo"),
 446                                    WXSIZEOF(encodingNames),
 447                                    encodingNames,
 448                                    this);
 449
 450     if ( n != -1 )
 451     {
 452         DoEnumerateFamilies(FALSE, encodings[n]);
 453     }
 454 }
 455
 456 void MyFrame::OnCheckNativeToFromString(wxCommandEvent& WXUNUSED(event))
 457 {
 458     wxString fontInfo = m_canvas->GetTextFont().GetNativeFontInfoDesc();
 459
 460     if ( fontInfo.IsEmpty() )
 461     {
 462         wxLogError(wxT("Native font info string is empty!"));
 463     }
 464     else
 465     {
 466         wxFont *font = wxFont::New(fontInfo);
 467         if ( fontInfo != font->GetNativeFontInfoDesc() )
 468             wxLogError(wxT("wxNativeFontInfo ToString()/FromString() broken!"));
 469         else
 470             wxLogMessage(wxT("wxNativeFontInfo works: %s"), fontInfo.c_str());
 471
 472         delete font;
 473      }
 474 }
 475
 476 void MyFrame::DoResizeFont(int diff)
 477 {
 478     wxFont font = m_canvas->GetTextFont();
 479
 480     font.SetPointSize(font.GetPointSize() + diff);
 481     DoChangeFont(font);
 482 }
 483
 484 void MyFrame::OnBold(wxCommandEvent& event)
 485 {
 486     wxFont font = m_canvas->GetTextFont();
 487
 488     font.SetWeight(event.IsChecked() ? wxFONTWEIGHT_BOLD : wxFONTWEIGHT_NORMAL);
 489     DoChangeFont(font);
 490 }
 491
 492 void MyFrame::OnItalic(wxCommandEvent& event)
 493 {
 494     wxFont font = m_canvas->GetTextFont();
 495
 496     font.SetStyle(event.IsChecked() ? wxFONTSTYLE_ITALIC : wxFONTSTYLE_NORMAL);
 497     DoChangeFont(font);
 498 }
 499
 500 void MyFrame::OnUnderline(wxCommandEvent& event)
 501 {
 502     wxFont font = m_canvas->GetTextFont();
 503
 504     font.SetUnderlined(event.IsChecked());
 505     DoChangeFont(font);
 506 }
 507
 508 void MyFrame::OnwxPointerFont(wxCommandEvent& event)
 509 {
 510     wxFont font;
 511
 512     switch (event.GetId())
 513     {
 514         case Font_wxNORMAL_FONT : font = wxFont(*wxNORMAL_FONT); break;
 515         case Font_wxSMALL_FONT  : font = wxFont(*wxSMALL_FONT); break;
 516         case Font_wxITALIC_FONT : font = wxFont(*wxITALIC_FONT); break;
 517         case Font_wxSWISS_FONT  : font = wxFont(*wxSWISS_FONT); break;
 518         default                 : font = wxFont(*wxNORMAL_FONT); break;
 519     }
 520
 521     GetMenuBar()->Check(Font_Bold, FALSE);
 522     GetMenuBar()->Check(Font_Italic, FALSE);
 523     GetMenuBar()->Check(Font_Underlined, FALSE);
 524
 525     DoChangeFont(font);
 526 }
 527
 528 void MyFrame::DoChangeFont(const wxFont& font, const wxColour& col)
 529 {
 530     m_canvas->SetTextFont(font);
 531     if ( col.Ok() )
 532         m_canvas->SetColour(col);
 533     m_canvas->Refresh();
 534
 535     m_textctrl->SetFont(font);
 536     if ( col.Ok() )
 537         m_textctrl->SetForegroundColour(col);
 538 }
 539
 540 void MyFrame::OnSelectFont(wxCommandEvent& WXUNUSED(event))
 541 {
 542     wxFontData data;
 543     data.SetInitialFont(m_canvas->GetTextFont());
 544     data.SetColour(m_canvas->GetColour());
 545
 546     wxFontDialog dialog(this, data);
 547     if ( dialog.ShowModal() == wxID_OK )
 548     {
 549         wxFontData retData = dialog.GetFontData();
 550         wxFont font = retData.GetChosenFont();
 551         wxColour colour = retData.GetColour();
 552
 553         DoChangeFont(font, colour);
 554
 555         // update the state of the bold/italic/underlined menu items
 556         wxMenuBar *mbar = GetMenuBar();
 557         if ( mbar )
 558         {
 559             mbar->Check(Font_Bold, font.GetWeight() == wxFONTWEIGHT_BOLD);
 560             mbar->Check(Font_Italic, font.GetStyle() == wxFONTSTYLE_ITALIC);
 561             mbar->Check(Font_Underlined, font.GetUnderlined());
 562         }
 563     }
 564 }
 565
 566 void MyFrame::OnQuit(wxCommandEvent& WXUNUSED(event))
 567 {
 568     // TRUE is to force the frame to close
 569     Close(TRUE);
 570 }
 571
 572 void MyFrame::OnViewMsg(wxCommandEvent& WXUNUSED(event))
 573 {
 574     // first, choose the file
 575     static wxString s_dir, s_file;
 576     wxFileDialog dialog(this, wxT("Open an email message file"),
 577                         s_dir, s_file);
 578     if ( dialog.ShowModal() != wxID_OK )
 579         return;
 580
 581     // save for the next time
 582     s_dir = dialog.GetDirectory();
 583     s_file = dialog.GetFilename();
 584
 585     wxString filename = dialog.GetPath();
 586
 587     // load it and search for Content-Type header
 588     wxTextFile file(filename);
 589     if ( !file.Open() )
 590         return;
 591
 592     wxString charset;
 593
 594     static const wxChar *prefix = wxT("Content-Type: text/plain; charset=");
 595     const size_t len = wxStrlen(prefix);
 596
 597     size_t n, count = file.GetLineCount();
 598     for ( n = 0; n < count; n++ )
 599     {
 600         wxString line = file[n];
 601
 602         if ( !line )
 603         {
 604             // if it is an email message, headers are over, no need to parse
 605             // all the file
 606             break;
 607         }
 608
 609         if ( line.Left(len) == prefix )
 610         {
 611             // found!
 612             const wxChar *pc = line.c_str() + len;
 613             if ( *pc == wxT('"') )
 614                 pc++;
 615
 616             while ( *pc && *pc != wxT('"') )
 617             {
 618                 charset += *pc++;
 619             }
 620
 621             break;
 622         }
 623     }
 624
 625     if ( !charset )
 626     {
 627         wxLogError(wxT("The file '%s' doesn't contain charset information."),
 628                    filename.c_str());
 629
 630         return;
 631     }
 632
 633     // ok, now get the corresponding encoding
 634     wxFontEncoding fontenc = wxFontMapper::Get()->CharsetToEncoding(charset);
 635     if ( fontenc == wxFONTENCODING_SYSTEM )
 636     {
 637         wxLogError(wxT("Charset '%s' is unsupported."), charset.c_str());
 638         return;
 639     }
 640
 641     m_textctrl->LoadFile(filename);
 642
 643     if ( fontenc == wxFONTENCODING_UTF8 ||
 644             !wxFontMapper::Get()->IsEncodingAvailable(fontenc) )
 645     {
 646         // try to find some similar encoding:
 647         wxFontEncoding encAlt;
 648         if ( wxFontMapper::Get()->GetAltForEncoding(fontenc, &encAlt) )
 649         {
 650             wxEncodingConverter conv;
 651
 652             if (conv.Init(fontenc, encAlt))
 653             {
 654                 fontenc = encAlt;
 655                 m_textctrl -> SetValue(conv.Convert(m_textctrl -> GetValue()));
 656             }
 657             else
 658             {
 659                 wxLogWarning(wxT("Cannot convert from '%s' to '%s'."),
 660                              wxFontMapper::GetEncodingDescription(fontenc).c_str(),
 661                              wxFontMapper::GetEncodingDescription(encAlt).c_str());
 662             }
 663         }
 664         else
 665             wxLogWarning(wxT("No fonts for encoding '%s' on this system."),
 666                          wxFontMapper::GetEncodingDescription(fontenc).c_str());
 667     }
 668
 669     // and now create the correct font
 670     if ( !DoEnumerateFamilies(FALSE, fontenc, TRUE /* silent */) )
 671     {
 672         wxFont font(12, wxFONTFAMILY_DEFAULT, wxFONTSTYLE_NORMAL,
 673                     wxFONTWEIGHT_NORMAL, FALSE /* !underlined */,
 674                     wxEmptyString /* facename */, fontenc);
 675         if ( font.Ok() )
 676         {
 677             DoChangeFont(font);
 678         }
 679         else
 680         {
 681             wxLogWarning(wxT("No fonts for encoding '%s' on this system."),
 682                          wxFontMapper::GetEncodingDescription(fontenc).c_str());
 683         }
 684     }
 685 }
 686
 687 void MyFrame::OnAbout(wxCommandEvent& WXUNUSED(event))
 688 {
 689     wxMessageBox(wxT("wxWindows font demo\n")
 690                  wxT("(c) 1999 Vadim Zeitlin"),
 691                  wxT("About Font"),
 692                  wxOK | wxICON_INFORMATION, this);
 693 }
 694
 695 // ----------------------------------------------------------------------------
 696 // MyCanvas
 697 // ----------------------------------------------------------------------------
 698
 699 BEGIN_EVENT_TABLE(MyCanvas, wxWindow)
 700     EVT_PAINT(MyCanvas::OnPaint)
 701 END_EVENT_TABLE()
 702
 703 MyCanvas::MyCanvas( wxWindow *parent )
 704         : wxWindow( parent, -1 ),
 705           m_colour(*wxRED), m_font(*wxNORMAL_FONT)
 706 {
 707 }
 708
 709 MyCanvas::~MyCanvas()
 710 {
 711 }
 712
 713 void MyCanvas::OnPaint( wxPaintEvent &WXUNUSED(event) )
 714 {
 715     wxPaintDC dc(this);
 716     PrepareDC(dc);
 717
 718     // set background
 719     dc.SetBackground(wxBrush(wxT("white"), wxSOLID));
 720     dc.Clear();
 721
 722     // one text line height
 723     wxCoord hLine = dc.GetCharHeight();
 724
 725     // the current text origin
 726     wxCoord x = 5,
 727             y = 5;
 728
 729     // output the font name/info
 730     wxString fontInfo;
 731     fontInfo.Printf(wxT("Font size is %d points, family: %s, encoding: %s"),
 732                     m_font.GetPointSize(),
 733                     m_font.GetFamilyString().c_str(),
 734                     wxFontMapper::Get()->
 735                         GetEncodingDescription(m_font.GetEncoding()).c_str());
 736
 737     dc.DrawText(fontInfo, x, y);
 738     y += hLine;
 739
 740     fontInfo.Printf(wxT("Style: %s, weight: %s, fixed width: %s"),
 741                     m_font.GetStyleString().c_str(),
 742                     m_font.GetWeightString().c_str(),
 743                     m_font.IsFixedWidth() ? _T("yes") : _T("no"));
 744
 745     dc.DrawText(fontInfo, x, y);
 746     y += hLine;
 747
 748     if ( m_font.Ok() )
 749     {
 750         const wxNativeFontInfo *info = m_font.GetNativeFontInfo();
 751         if ( info )
 752         {
 753             wxString fontDesc = m_font.GetNativeFontInfoUserDesc();
 754             fontInfo.Printf(wxT("Native font info: %s"), fontDesc.c_str());
 755
 756             dc.DrawText(fontInfo, x, y);
 757             y += hLine;
 758         }
 759     }
 760
 761     y += hLine;
 762
 763     // prepare to draw the font
 764     dc.SetFont(m_font);
 765     dc.SetTextForeground(m_colour);
 766
 767     // the size of one cell (Normally biggest char + small margin)
 768     long maxCharWidth, maxCharHeight;
 769     dc.GetTextExtent(wxT("W"), &maxCharWidth, &maxCharHeight);
 770     int w = maxCharWidth + 5,
 771         h = maxCharHeight + 4;
 772
 773
 774     // print all font symbols from 32 to 256 in 7 rows of 32 chars each
 775     for ( int i = 0; i < 7; i++ )
 776     {
 777         for ( int j = 0; j < 32; j++ )
 778         {
 779             wxChar c = 32 * (i + 1) + j;
 780
 781             long charWidth, charHeight;
 782             dc.GetTextExtent(c, &charWidth, &charHeight);
 783             dc.DrawText
 784             (
 785                 c,
 786                 x + w*j + (maxCharWidth - charWidth) / 2 + 1,
 787                 y + h*i + (maxCharHeight - charHeight) / 2
 788             );
 789         }
 790     }
 791
 792     // draw the lines between them
 793     dc.SetPen(wxPen(wxColour(_T("blue")), 1, wxSOLID));
 794     int l;
 795
 796     // horizontal
 797     for ( l = 0; l < 8; l++ )
 798     {
 799         int yl = y + h*l - 2;
 800         dc.DrawLine(x - 2, yl, x + 32*w - 1, yl);
 801     }
 802
 803     // and vertical
 804     for ( l = 0; l < 33; l++ )
 805     {
 806         int xl = x + w*l - 2;
 807         dc.DrawLine(xl, y - 2, xl, y + 7*h - 1);
 808     }
 809 }